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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67cc627afed862e2e0cb99115d5e6e950361b507213409e497845d4bed072881' 
  AND token = '8a9grsZBD3ltPjrT51WeqVFAWHxc2YUMa3WGUeoCwOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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