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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '542ff20b9c0b896dbc4d8d40b548eab5970816110098120558eda93b634301d4' 
  AND token = 'ai3NqyynJn4vC5j25ssBoO+rxCds9ktpF4P/Fg9RHZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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