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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55d98c316657c57f9842a0520501cd3e8a93b3ea9ac8ae2748b0a1aa89e1b270' 
  AND token = '1l5bqDgjPGb2VyDqAh1xg2WGNZwAZgQWDYpgEXUMQqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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