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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edab214e3c6dd3b27cecc6a5debeb29fd4865c2670ea0885e459c3f8f7b5e408' 
  AND token = 'SnWMM82pTv1jB1mze9+2osl/13sZzC+52EVDw2RhYMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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