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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '413300c693b93a8d6362656dcae1ceb1f0ab1558d61dc9f9267aa6fbbfbf4dd0' 
  AND token = 'pr16MmYyaKTGdNpsy0CqCXiFHdQqTt0wLLspr4V0PG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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