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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd3862c45a5c90acf43396b63c52303f7914f27a7ee5033f1e06b01e131f6c38' 
  AND token = 'heuLffdqbalNR9a+F6PWOjQXjAXPo5kj3p3E3Rd6RNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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