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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efcc25f1017fc2a410c52394447899144a5f4986d7e0a25640ae4758e8688b6e' 
  AND token = 'fUYyjTMo6l07gFd8KMInZQ9eLYiAMGzHOmRKOEs2V+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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