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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44db4e3e50dd4b303a554d4b57c502d09f38c7b3451089b3dd4e75d0210f0ab5' 
  AND token = '9Zf78D+i9aIxumK/poW/1R9ORhALYbdjUXfW9suTxhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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