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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87c8bfee8473fb86fbb3f944355a22d3e0b2445d74ec4513c9d5d7e3ba3f8427' 
  AND token = 'ErwoxUOyonkYQdq1Bmc18LqaW/PG7OZRUJnXA8RdLZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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