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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9c7dedbfc24a7ffa8e37856099866321eec4892b2b6f2250c9588797f3a2e72' 
  AND token = '1yE2hmmSfD7RL0KdGnwdBhzytbf/9Wykwqzg0t5X49I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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