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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2538f25e88d70dbb4aaee6339341ef0c71fbfa72e8ee1bbb5299a37cea3e5a9' 
  AND token = 'J2Mx6VYZMqK3A285f4SbF/5GvWLa7QI25G++V7gy6KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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