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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebf74e9e6bbb1bb2ba23f5de3c3fe5f84d519720213ea5a435650b097b401ab1' 
  AND token = 'EbhuQeB24ZCAFx1xoja84+p+GeKBqKQm2Ev//4FHo90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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