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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47f291e6ff9567b798ee044076631a2784ccffc5551da60749d8918d9d17466c' 
  AND token = 'mEGi1CjBiAqp6azy3/et9rku4KA4DXKlYcMe7JDNgUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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