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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41f77ed27097420e332e9b18cee7236318d809d7f13828c697b3aa9863e717a9' 
  AND token = 'x67OiuU+mKbshOOOGy/lGr5e54wj6JjLpJi7Z2ar8b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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