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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4aee65a3f221570d8e99e7a3b6faf8e58d7b6412ac220aceec041d73a6d27cf' 
  AND token = '8y/nGWj4F68VAU/Q7WYfgKeJgksWD7GVodjvgcBe7tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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