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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3be4a6a80e6e05d4da677078d1729f7c76b37c16a4d44b539ff9dc3a7d1b9466' 
  AND token = 'm8SLiUxYPUUIoORWvIeRvFS8cYbi/qYne359WYbtgqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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