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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f342eca5d5c220b439a96c4991f7a30591308ce97b13f349bd423f735f14b542' 
  AND token = 'SzUt23AWdfE1hLmTFWmImC6pDRVTJT+8C9fGaeHTxQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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