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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27c30c0510f6bb21a71b651e0de226b773f55050f15d91c3154c5e22a923c7be' 
  AND token = 'ZSZA2+QEG6chrdapERrBxsVVG8889KERScybV4iz9fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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