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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbb5f0f9792b4d1264a868544983b6281ad8bb775edeeca0b4ea3a9ae53095cb' 
  AND token = 'lHDAw1x5m1sZ93SYV1GYW64ot1O47Jv2+5mhHPYZSas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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