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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d18fc72563ea01da3b9f2379493ef266c77a4b2100240f0cc28a002ea185b7e' 
  AND token = 'WEIGjtOgaFjYsEExNQmklq95C9K1XV7Wm5HEGmigvHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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