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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbe3d8507df4a6f8d6541939f5394b936dc9b286df1b48ef92d299f137db1891' 
  AND token = 'S2dJCKyr1Dp05RaobM8cUJwzyLK5YHzed/e6mwjyLI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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