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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b71affdbb2e6e2aaf815eb831f485b9108b8dd17cd251ed35dad1e312d8947b' 
  AND token = 'SwA1zlKV1A13GmdrwqQEQBig6Au2rUd9IARByhBa/do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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