SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9474ef9003dd84d6519d157d3308ce0b88881530369d09fba6dcf5ec6cefcba2' 
  AND token = 's2R5IRV8As7BVAeAoYvXdXYWZQ2/60PFjmYcwbZ4gRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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