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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edf3628e8db116926f7e5b120fe472504d77b81a61840691f3b7a8fa712cfc85' 
  AND token = 'g41vofENI5O5XkOmyMYaYdbCF9/9y/DVJPQHsJOjTac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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