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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fa49680a2b97cbc65d14eff9e64cba5b41230626c5c69b4e3ac5e33f97e6cd4' 
  AND token = 'dR2J9HNMtLq0B1cs158IkrLyiBO+x6Ocud5FGZeSquo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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