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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3d2644a4a3cd662ecc5cab2cf24fa07a25c0e0cc0be5b86244893f086a6ccbf' 
  AND token = '6aMo4VYJz1diETLxF2c147bIHcr4xS4nHr3RmU2I4os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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