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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd79f409cfda60474514ad8cd0a904e00151ae879c59b7fc6ab6295615676272e' 
  AND token = 'F0EJfR5VeUZUXtoeQ/bbT0xZSFobwu3TyoIyYKOg7PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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