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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4aeb00325bdc762fe6f2584c5d102cf3e8d0c9b6e2fec70d53ce574887af05e' 
  AND token = '7FNSC0lcZyW13ji2tjHez6Y6YobyyL1kBN/do8KsE4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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