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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '591599033c0f74db51f8c6680756371f760f6bd1f7ae20e6b77ba58f1e4599fa' 
  AND token = 'fAC0zHNm8r6+XKpcuDNrpwHHBKK3uh5Rugn8yfOdUfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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