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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d65be5fdfb0716b594ab18e8b1e16c81018c61915d5b9fea56e7cb7c6609bd3' 
  AND token = 'tiOPOxyPA6For0SLk1naJGmCC5oky+KV6gW+1YMRYsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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