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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aba8ba67fe289ca7cf2bcf78832925cd146c867e99beadf7d0e5fd7e976d3d78' 
  AND token = '60F+1WsPRrlr2yl7jmMymiBqhVIbcMT1F62yCshBwj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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