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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '392b092c84926a7e346c6033f30ec536d3e3889935e7cb011db9b4c1b0169dc5' 
  AND token = '1ILc6aWJkuMX2YSAX7dpJfTnIkGlB3HezZx8ZQ4uEiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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