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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '506dfc014c33e743abf1b4be30bcebf49013bc9a8b2291dd68592b1a669ae70f' 
  AND token = 'VX+mzcmkt43oZv6p+2xQixuGb4/3Vhupelrql72eXik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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