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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '114a080a6dbf1f5fb992a855dd050825d313dff078289442d51b2b13af83f6b2' 
  AND token = 'RAhNbepd6Hj8HKYzEbu1L8nvkT23ZjjWl8k7mWxWX3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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