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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b5cbc0e09025fdcf4f0bd8edaf5d74f2654ce340644c467e8b7a09099335bf9' 
  AND token = 'hjKD+QsrrD0CNWli9H7rQtJ/Sp9BJRHDjRa/J9pPp8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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