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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa15415673302247d84f36b95019f145ad87d53a143bf207ed1be25b17e866c4' 
  AND token = 'TksghRuepJOTAx937+N5QX5wi22SQimBkTOuGAG2QhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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