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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d37923738732eec6b019105ac7a6285a2007f67c6b1ac051f3e4bd0b470e546' 
  AND token = 'rCe97U0a/KiKr8iMwwtPE8LpAE7kqF4Vp/9pSe7SE4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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