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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cf1867ddd3f89a375a5b2ad85c65510088526351a03a91e578f56e98dc2a4e7' 
  AND token = '8ayjS8yqXExKo/GCkRXawTRAuGc75uZxHELfSqFFyrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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