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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6596a59389a31bec3ec569f45671e9c884eb272fc6b6f92029eb6e0e81bcf991' 
  AND token = 'AFf+6mOkLxl21kIpYEosj/h+8GM5P8CXWfT7hASQsIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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