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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91fb43bd61b0e7d04119a280d65f4b930e2b10a2454e3a3bed1bead4f729eaef' 
  AND token = '3qdtAnjIwvc22iz6/XNSjSQpFTquMeVijSI2B5/Tgio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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