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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b830806c2d531ce8b2e5401a6371b94ffb78b41f01f8c51df715f51f1945da4b' 
  AND token = '13eKHC2Kg5Au9+pjj3fPLO7ZZM37bsBdPp9I7psSTM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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