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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8366e8f9d68128a3b011af22aadc40c237c653664d0889f537bf78fb0c8d2072' 
  AND token = 'd6MZ59+9TUDxGXA5yCET+u+Glt5qDGDl0dknsuIKUoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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