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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba72a942dcf6494de281593eb0c6a259bb50eaff2eac3266a7aacb5b5625a41a' 
  AND token = 'AGWPU/I+a25SEKQSgb7dLpve2UEW7rxUtm7uZD53mxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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