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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee72c56dc6fdd1b0a16e0ffca5cf953ba147fb19684f4395b958980b7e0b9ec3' 
  AND token = 'KxOVwTUG6zVrvF8sfmbAIocNbM9q9YJRFijSDcQtk48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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