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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f57aed248cc7e5d4e8a6b70281f352d1d9039b67a638a1ca7938a77a28ee9a6' 
  AND token = 'FTgH49Kcu2mthX5DJzDEfPaKI/qfx8MvE8CBm778e1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}