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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de829ecee1dafb1571daf05c5b6d71b37b35ccc0b4f8a0e8591ef759c28072ad' 
  AND token = 'x5DQDB7uN80cdEecsHP0dragqLh2jdFkuS7SRnqPHbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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