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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b9763cfd7f208482f2cdfcf4aa754ec9ca4f2bb7a08e962a6c0d336003c6c07' 
  AND token = 'l58Ba55Q/kBCjd9zLHZzP37PeHxOZkyBwHPkv+vc9rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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