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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64994375e7a4781957531c7ad9d8b0fea5979e76f98e600b1c9a2877e65bbdb2' 
  AND token = 'Cj41ysovTwVoS9hB6BGA6p1trs9MFeonKB+S133cxa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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