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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da8c8847c3dd93a93fb36b7fb589fb28c1e17c8a19bc0428c54ed58dc21c6f73' 
  AND token = 'k+81USnd0gWy19/2PBv8egrXaugtgzelME03YwCavQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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