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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5918c7e30dcc002937bcd4e70a93b96fc0431b9908725565da3fb5418a0e07c5' 
  AND token = 'g+rfdEKul7KQ9iT7pJCWk06LFd/jP45E936DeXCzTow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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