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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8b62492c0bf2b67a0de93cbb1ec7c24aa3212f18a7c347a5ac138224f814de1' 
  AND token = '/vQ0F13PQ8yHgKeA1kTv8UloDRR5gAKtedFybVks3FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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