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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c75831502ae7a5657e71d70f8642030d2431506df301a7d191db03f637f37e4d' 
  AND token = 'guVtw8A/iOSPSJjByofZ80jdQ5Rs0DklECTnClWEzr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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